Apparatus and method for communicating voice and data between a customer premises and a central office

  • US 6,061,392 A
  • Filed: 11/03/1997
  • Issued: 05/09/2000
  • Est. Priority Date: 12/17/1996
  • Status: Expired due to Term
First Claim
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1. A modem for communicating across a communication link comprising:

  • an input/output signal line in communication with the communication link;

    a processor unit adapted for operation in one of at least two states, a full-band transmission state and a band-limited state, wherein the full-band transmission state is defined by significant transmission energy in a frequency range below a first frequency, and a band-limited transmission state defined by a negligible amount of energy in the frequency range below the first frequency and a significant amount of energy above the first frequency, wherein the first frequency is at least 4000 Hertz.

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